PHOTOS: Brock Lesnar on “Late Night with Jimmy Fallon”

The only man to hold both the Undisputed WWE Heavyweight Championship and the Undisputed UFC Heavyweight Championship, Brock Lesnar was a guest on NBC-TV’s "Late Night with Jimmy Fallon" last night.

Lesnar was promoting the debut this Wednesday of SpikeTV’s "The Ultimate Fighter" season 13, in which he and #1 contender Junior Dos Santos are opposing coaches. The two will then fight on June 11th in Vancouver, British Columbia, with the winner facing UFC World Heavyweight Champion Cain Velasquez for the title later this year when the champion returns from major shoulder surgery.

Lesnar also promoted his upcoming book, "Death Clutch," which he co-wrote with longtime friend (and former WWE on-air manager as well as Lesnar’s behind-the-scenes writer and producer in World Wrestling Entertainment) Paul Heyman. You can pre-order Lesnar’s book (and Heyman’s book, "The Heyman Hustle: Pro Wrestling’s Most Extreme Promoter Tells All!") on Amazon HERE.

You can see the entire gallery of Lesnar’s heavily-praised appearance on Fallon’s late night talk show by clicking on the appropriate links below.